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src/share/vm/gc_implementation/parallelScavenge/adjoiningGenerations.hpp@c18cbe5936b8 (annotated)
src/share/vm/gc_implementation/parallelScavenge/adjoiningGenerations.hpp
Thu, 27 May 2010 19:08:38 -0700
- author
- trims
- date
- Thu, 27 May 2010 19:08:38 -0700
- changeset 1907
- c18cbe5936b8
- parent 435
- a61af66fc99e
- child 2314
- f95d63e2154a
- permissions
- -rw-r--r--
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| duke@435 | 1 | /* |
| trims@1907 | 2 | * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved. |
| duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| duke@435 | 4 | * |
| duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
| duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| duke@435 | 7 | * published by the Free Software Foundation. |
| duke@435 | 8 | * |
| duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| duke@435 | 13 | * accompanied this code). |
| duke@435 | 14 | * |
| duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
| duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| duke@435 | 18 | * |
| trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
| trims@1907 | 21 | * questions. |
| duke@435 | 22 | * |
| duke@435 | 23 | */ |
| duke@435 | 24 | |
| duke@435 | 25 | |
| duke@435 | 26 | // Contains two generations that both use an AdjoiningVirtualSpaces. |
| duke@435 | 27 | // The two generations are adjacent in the reserved space for the |
| duke@435 | 28 | // heap. Each generation has a virtual space and shrinking and |
| duke@435 | 29 | // expanding of the generations can still be down with that |
| duke@435 | 30 | // virtual space as was previously done. If expanding of reserved |
| duke@435 | 31 | // size of a generation is required, the adjacent generation |
| duke@435 | 32 | // must be shrunk. Adjusting the boundary between the generations |
| duke@435 | 33 | // is called for in this class. |
| duke@435 | 34 | |
| duke@435 | 35 | class AdjoiningGenerations : public CHeapObj { |
| duke@435 | 36 | friend class VMStructs; |
| duke@435 | 37 | private: |
| duke@435 | 38 | // The young generation and old generation, respectively |
| duke@435 | 39 | PSYoungGen* _young_gen; |
| duke@435 | 40 | PSOldGen* _old_gen; |
| duke@435 | 41 | |
| duke@435 | 42 | // The spaces used by the two generations. |
| duke@435 | 43 | AdjoiningVirtualSpaces _virtual_spaces; |
| duke@435 | 44 | |
| duke@435 | 45 | // Move boundary up to expand old gen. Checks are made to |
| duke@435 | 46 | // determine if the move can be done with specified limits. |
| duke@435 | 47 | void request_old_gen_expansion(size_t desired_change_in_bytes); |
| duke@435 | 48 | // Move boundary down to expand young gen. |
| duke@435 | 49 | bool request_young_gen_expansion(size_t desired_change_in_bytes); |
| duke@435 | 50 | |
| duke@435 | 51 | public: |
| duke@435 | 52 | AdjoiningGenerations(ReservedSpace rs, |
| duke@435 | 53 | size_t init_low_byte_size, |
| duke@435 | 54 | size_t min_low_byte_size, |
| duke@435 | 55 | size_t max_low_byte_size, |
| duke@435 | 56 | size_t init_high_byte_size, |
| duke@435 | 57 | size_t min_high_byte_size, |
| duke@435 | 58 | size_t max_high_bytes_size, |
| duke@435 | 59 | size_t alignment); |
| duke@435 | 60 | |
| duke@435 | 61 | // Accessors |
| duke@435 | 62 | PSYoungGen* young_gen() { return _young_gen; } |
| duke@435 | 63 | PSOldGen* old_gen() { return _old_gen; } |
| duke@435 | 64 | |
| duke@435 | 65 | AdjoiningVirtualSpaces* virtual_spaces() { return &_virtual_spaces; } |
| duke@435 | 66 | |
| duke@435 | 67 | // Additional space is needed in the old generation. Check |
| duke@435 | 68 | // the available space and attempt to move the boundary if more space |
| duke@435 | 69 | // is needed. The growth is not guaranteed to occur. |
| duke@435 | 70 | void adjust_boundary_for_old_gen_needs(size_t desired_change_in_bytes); |
| duke@435 | 71 | // Similary for a growth of the young generation. |
| duke@435 | 72 | void adjust_boundary_for_young_gen_needs(size_t eden_size, size_t survivor_size); |
| duke@435 | 73 | |
| duke@435 | 74 | // Return the total byte size of the reserved space |
| duke@435 | 75 | // for the adjoining generations. |
| duke@435 | 76 | size_t reserved_byte_size(); |
| duke@435 | 77 | }; |
